- The genes and transcripts dealing phenylpropanoid biosynthetic pathway in A. grossedentata were identified. The average fpkm for young (YL) and old (OL) leaves from 3 samples each, the gene length and the ratio were shown. Fpkm ratio of YL/OL and OL/YL was given wherever the value greater than 2 was marked in yellow and red, respectively. The key pathway genes, whose counterparts were also found in NCBI database, highlighted with green, were used as template for q-PCR in Fig. 6